a=1
print(a)
a=2
print(a)
print()

a = "Li"
b = "Hua"
c = f"{a}{b}"
print(f"hello,{c}")
print()

name = "Li hua"
print(name.upper())
print(name.lower())
print(name.title())
print()

print('Albert Einstein once said,"A person who never made a mistake never tried anything new"')
print()

famous_person = "Albert Einstein"
message = f'{famous_person} once said,"A person who never made a mistake never tried anything new"'
print(message)
print()

a = "  Lihua  "
print(f"0{a}0\n")
print(f"0{a.rstrip()}0")
print(f"0{a.lstrip()}0")
print(f"0{a.strip()}0")
print()

print(5+3)
print(10-2)
print(2*4)
print(16/2)
print()

a = 13
b = "my favourite number is "
message = f"{b} {a}"
print(message)
print()

print("hello py") #这是打印
print()

import this #WOW


